1. A
   Tiger will start eating grass.
2. B
   The population of grass will decrease.
3. C
   The population of tiger will decreases and the population of grass will increase.
4. D
   The population of tiger will increase.

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1. A
   Ecosystem
2. B
   Community
3. C
   Trophic levels
4. D
   Food web

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1. A
   Gases used in house for cooking
2. B
   Green in colour
3. C
   Trap solar radiations and decrease temperature
4. D
   Trap solar radiations and increase temperature

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1. A
   Energy flow and nutrient movement
2. B
   Energy flow only
3. C
   Nutrient flow only
4. D
   Vitamins flow only

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1. A
   Decomposers
2. B
   Consumers
3. C
   Composers
4. D
   Producers

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1. A
   Food supply
2. B
   Decrease in energy at each trophic level
3. C
   Inadequate air
4. D
   Water

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1. A
   4 trophic levels
2. B
   5 trophic levels
3. C
   2 trophic levels
4. D
   3 trophic levels

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1. A
   Food web
2. B
   Food cycle
3. C
   Food chain
4. D
   Food store

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1. A
   They are non-biodegradable.
2. B
   They are expensive.
3. C
   They are cheap.
4. D
   They are biodegradable.

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1. A
   A and C
2. B
   B and C
3. C
   A and B
4. D
   A and D

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1. A
   5000 KJ
2. B
   50 KJ
3. C
   5 KJ
4. D
   500 KJ

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1. A
   Primary consumer to secondary consumer
2. B
   Secondary consumer to primary consumer
3. C
   Producer to decomposer
4. D
   Producer to primary consumer

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1. A
   All of these
2. B
   A and B
3. C
   A and C
4. D
   A, B and C

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1. A
   More UV radiations on earth
2. B
   Curing of cancer
3. C
   Decrease in temperature
4. D
   Less UV radiations on earth

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1. A
   (i) and (ii)
2. B
   (i), (iv) and (v)
3. C
   (ii) and (iii)
4. D
   (i), (iii) and (iv)

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1. A
   They are made of non-biodegradable material.
2. B
   They are made of biodegradable materials.
3. C
   They are made of toxic materials.
4. D
   They are made of materials with light weight.

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1. A
   Climatic factors
2. B
   Decomposers
3. C
   Both Inorganic substances and climatic factors
4. D
   Inorganic substances

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1. A
   Producers
2. B
   Decomposers
3. C
   Herbivores
4. D
   Carnivores

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1. A
   A, B and D
2. B
   A and D
3. C
   A and B
4. D
   A, C and D

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1. A
   Kyoto protocol - 1982
2. B
   Chipko Movement - 1973
3. C
   Montreal Protocol - 1987
4. D
   Ganga Action Plan - 1986

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1. A
   Carrying cloth-bag to put purchases in while shopping
2. B
   Walking to school instead of getting your mother to drop you on her scooter
3. C
   Switching off unnecessary lights and fans
4. D
   All of these

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1. A
   Respiration
2. B
   Decomposition
3. C
   Photosynthesis
4. D
   Nitrogen fixation

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1. A
   Association
2. B
   Biomes
3. C
   Biosphere
4. D
   Community

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1. A
   B and C
2. B
   A and C
3. C
   A and B
4. D
   All of these

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1. A
   Decomposers
2. B
   Carnivores
3. C
   Herbivores
4. D
   Producers

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